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Route Optimization based on ND-Proxy for Mobile Nodes in IPv6 Mobile Networks PowerPoint PPT Presentation

VTC2004- Spring Route Optimization based on ND-Proxy for Mobile Nodes in IPv6 Mobile Networks Jaehoon Jeong, Kyeongjin Lee, Jungsoo Park, Hyoungjun Kim ETRI {paul,leekj,pjs,[email protected] http://www.adhoc.6ants.net/~paul This paper and presentation material are posted on the above site.

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Route Optimization based on ND-Proxy for Mobile Nodes in IPv6 Mobile Networks

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Route optimization based on nd proxy for mobile nodes in ipv6 mobile networks l.jpg

VTC2004- Spring

Route Optimization based on ND-Proxy for Mobile Nodes in IPv6 Mobile Networks

Jaehoon Jeong, Kyeongjin Lee, Jungsoo Park, Hyoungjun KimETRI{paul,leekj,pjs,[email protected]

http://www.adhoc.6ants.net/~paulThis paper and presentation material are posted on the above site.


Contents l.jpg

Contents

  • Motivation

  • Network Mobility (NEMO)

  • Related Work

  • Main Idea

  • Multilink Subnet

  • ND-Proxy based Route Optimization

  • Procedure of Route Optimization in Mobile Node

  • Analysis of Route Optimization

  • Conclusion


Motivation l.jpg

Motivation

  • Network Mobility (NEMO) Basic Support protocol

    • Object of NEMO

      • NEMO allows a mobile network reachable in the Internet through Mobile IPv6 Extension.

    • NEMO is being developed at IETF NEMO working group

    • Limitation of Current NEMO Protocol

      • NEMO supports network mobility by bi-directional tunneling between Mobile Router (MR) and Home Agent (HA).

      • This does not support route optimization between Mobile Network and Correspondent Node.

  • Goal of This Paper

    • Support of Direct Communication between Mobile Node (MN) and Correspondent Node (CN) through Optimal Path


Network mobility nemo 1 2 l.jpg

Network Mobility (NEMO) – 1/2

  • Role of NEMO Protocol

    • Session Continuity of Mobile Network Node (MNN)

    • Connectivity of MNN

    • Reachability of MNN

      • Location Management

  • Key Idea of NEMO

    • HA forwards data packets destined for Mobile Network.

    • HA maintains the forwarding information related to Mobile Network Prefix(es).


Network mobility nemo 2 2 l.jpg

Network Mobility (NEMO) – 2/2

  • Management of Mobile Network Prefix

    • Binding Update of Implicit Mode

    • Binding Update of Explicit Mode

    • Dynamic Routing Protocols

  • Refer to NEMO draft for detailed information

    • draft-ietf-nemo-basic-support-02.txt


Related work l.jpg

Related Work

  • Route Optimization based on Prefix Delegation

    • Mobile Router (MR) gets a Network Prefix of Access Network through Prefix Delegation Protocol, such as DHCPv6.

      • MR gets a new prefix from Access Router on a foreign link.

    • MR provides the prefix for its Mobile Nodes, which is used to make Care-of Address of Mobile Node within Mobile Network.

      • The prefix is advertised through Router Advertisement (RA) message by MR.

    • Route Optimization

      • This makes a direct communication between CN and MN possible via an optimal path, not via a bi-directional tunnel between MR and HA.


Main idea l.jpg

Main Idea

  • Route Optimization though Proxying

    • Mobile Router (MR) provides the network prefix of its Care-of Address (CoA) for its mobile nodes by playing the role of Neighbor Discovery (ND) Proxy.

      • Refer to draft-ietf-ipv6-multilink-subnets-00.txt

    • Mobile Node (MN) can make its CoA as if it is attached to access network directly like MR.

    • MN and CN can communicate each other via an optimal path because MR forwards their packets as proxy.


Multilink subnet l.jpg

Multilink Subnet

  • Multilink Subnet

    • A collection of independent links, connected by routers, but sharing a common subnet prefix.

    • A Multilink Subnet consists of Subnet, NEMO1 and NEMO2 like in the figure.


Nd proxy based route optimization l.jpg

ND-Proxy based Route Optimization

  • Advertisement of Access Network Prefix

    • Access Router AR1 advertises its subnet prefix, AR1_P, like in the figure.

    • MR1, MR2 and MR3 relay the prefix information received through Proxy-mode interface to Router-mode interface.


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Procedure of Route Optimization in Mobile Node – 1/2

  • Generation of a new CoA

    • MN makes its new CoA with access network prefix advertised by MR.

  • DAD for the new CoA

    • MN performs Duplicate Address Detection (DAD) of its new CoA.

    • The DAD message, Neighbor Solicitation, is disseminated to the entire mobile network, a multilink subnet by MRs.

    • MRs store the MN’s link-local address included in DAD message in their Neighbor Cache.

      • The link-local address in MR’s Neighbor Cache is used to forward data packets destined to the MN.

  • Return Routability and Binding Update

    • MN performs Return Routability and Binding Update for Route Optimization like in Mobile IPv6.


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Procedure of Route Optimization in Mobile Node – 2/2

  • Delivery of Data Packets

    • When AR receives data packets destined to an MN and there is no neighbor information for the MN,

      • The AR multicasts a Neighbor Solicitation (NS) message for address resolution to the solicited-node multicast address of the MN’s IPv6 address.

    • If an MR knows the link-layer address of the MN,

      • As ND-Proxy, the MR responds to the NS message by returning its own link-layer address with a unicast Neighbor Advertisement (NA) to the source of the NS message.

    • Like this, a path is set up between AR and MN through intermediate MRs and AR can forward data packet to MN.


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Analysis of Route Optimization

1. Dog-legged Routing via Bi-directional Tunnel

2. Route Optimization via Optimal Path

Delay Difference of 1 and 2  d where d is the distance b/w HA & MR


Conclusion l.jpg

Conclusion

  • Route Optimization in Multiple Nested Mobile Networks

    • The communication based on bi-directional tunnel leads to add tunneling delay in proportion to the number of nested mobile network’s levels.

    • Route optimization in this paper reduces packet delay, packet size and tunneling overhead in Mobile Router.

      • Because packet size becomes bigger due to extra IPv6 header attached to packet per level of nesting.

  • Route Optimization for Mobile Nodes is necessary and important when thinking about applicable scenarios.

    • Network Mobility Service in Public Transportation, such as Bus, Train and Airplane.


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